Apple has finally released iOS 5 and you can now download it from Apple's servers. However, you'll need to upgrade your iTunes to version 10.5 first though.
By and large, the upgrade seems to be trouble free but there are reports of users who are experiencing problems.
Once you've updated your phone, check out Macworld's always excellent coverage. They have a review of iOS 5, and a close look at notifications in iOS 5, iMessage and iCloud.
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